Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Interconversions between the three states of matter
19 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
2 marks · Normal
Answer and see the solution →Explain why the particles in a liquid are able to move past each other, while the particles in a solid cannot.
Question 2
4 marks · Normal
Answer and see the solution →The diagram below shows a substance being heated until it completely changes from solid to gas.
(a)[1 mark]State the name of the process occurring as the solid changes directly to a gas.
(b)[2 marks]Describe what happens to the arrangement and movement of the particles during this process.
(c)[1 mark]Name the reverse process (gas to solid) and give one example of a substance that sublimates.
Question 3
3 marks · Normal
Answer and see the solution →Ammonium chloride can change directly from a solid to a gas when heated. Explain why the process observed is called sublimation, and describe what happens to the particles during this process.
Question 4
4 marks · Normal
Answer and see the solution →The table shows the melting and boiling points of three substances at standard pressure.
Melting and boiling points of substances Substance Melting point (°C) Boiling point (°C) A –15 58 B 112 212 C 75 –10 (a)[2 marks]At room temperature (20°C), name the physical state of each substance (A, B, and C).
(b)[2 marks]Explain why substance C cannot exist as a liquid at room temperature.
Question 5
1 mark · Normal
Answer and check →Which of the following processes describes a gas changing directly to a solid?
- A.Evaporation
- B.Condensation
- C.Deposition
- D.Melting
Question 6
2 marks · Normal
Answer and see the solution →Describe what happens to the forces between particles as a solid melts to form a liquid. Refer to particle theory in your answer.
Question 7
4 marks · Normal
Answer and see the solution →Complete the table below about the names of the processes for interconversion between all three states of matter.
(a)[2 marks]From state To state Process name Solid Liquid ? Liquid Gas ? Gas Liquid ? Gas Solid ? (b)[2 marks]Describe how the energy of the particles changes in the process from liquid to gas.
Question 8
3 marks · Normal
Answer and see the solution →A student heats 10 g of solid iodine in a sealed container. The iodine sublimes completely, forming a gas. The total mass of the container and its contents does not change during this process.
(a)[1 mark]State the process that occurs when solid iodine changes directly into a gas.
(b)[2 marks]Explain, using particle theory, why the mass of the container and its contents does not change when the solid turns into a gas. Include ideas about particles and their arrangement.